body {
  font-family: Menlo, Consolas, monospace;
  display: flex;
  padding-top: 20px;
  justify-content: center;
  color: #444;
  height: 100%;
  width: 100%;
}

.equation {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 42px;
  padding: 30px;
  color: #ddd;
  font-weight: bolder;
  -webkit-text-stroke: 1px #777;
  /* background: #409eff; */
}

#app {
  display: flex;
  flex-direction: column;
  position: relative;
  border: 2px #bbb solid;
  width: 375px;
  height: 700px;
}

.xx-row {
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1px;
  /* background: #bbbb; */
}

.finished {
  height: 490px;
  flex: 1;
  margin: 20px;
  padding: 6px 10px;
  background: #eee;
  overflow-y: auto;
}
.list {
  font-size: 12px;
  height: 22px;
  display: flex;
  /* background: #ddd; */
}
.tips {
  font-size: 12px;
  color: red;
  padding: 0 20px 6px 20px;
}

.xx-col {
  flex: 1;
  font-size: 1.4rem;
  font-weight: bold;
  height: 3rem;
  margin-right: 1px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: #409eff;
  cursor: pointer;
}
.xx-col:hover {
  background: #aaa;
}

.mask {
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 99999;
  height: 100%;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pop {
  width: 280px;
  height: 120px;
  background: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;

  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12), 0 0 6px rgba(0, 0, 0, 0.04);
}

.welcome {
  border-radius: 4px;
  margin-bottom: 10px;
}

#start {
  color: #333;
  background: #fff;
  bottom: 12px;
  font-size: 14px;
  font-weight: border;
  padding: 4px 6px;
  border-radius: 4px;
  border: 1px #e6a23c solid;
}

#start:hover {
  background: #e6a23c;
  color: #fff;
  border: 1px #e6a23c solid;
  cursor: pointer;
}
.top {
  display: flex;
  align-items: center;
  font-size: 14px;
  padding: 6px 8px;
  background: #eee;
}
